Pre-assembled coupling assemblies with pipe fitting

ABSTRACT

A pipe fitting configured for engagement with a coupling can include a first end, the pipe fitting defining a raised lip at the first end; and a second end disposed opposite from the first end, the pipe fitting defining a groove between the raised lip and the second end. A pre-assembled coupling assembly includes a coupling, the coupling defining a coupling bore extending through the coupling, the coupling including a gasket disposed within the coupling bore, the gasket being relaxed and uncompressed when the coupling is in a relaxed position; and a pipe fitting, the pipe fitting defining a first end and a second end, the first end inserted into the coupling bore, the coupling retained on the first end of the pipe fitting when the coupling is in the relaxed position.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Provisional Application No. 62/538,480, filed on Jul. 28, 2017, which is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

This disclosure relates to couplings and pipe fittings. More specifically, this disclosure relates to couplings which are retained on pipe fittings to form a pre-assembled coupling assembly.

BACKGROUND

Pipe couplings are commonly used to connect two pipe elements, such as pipe lengths and pipe fittings, to assemble a piping system. Pipe fittings can include elbows, tees, caps, valves, reducers, sprinklers, and other types of pipe fittings. Slip-on pipe couplings are one type of pipe coupling which can be slipped over the ends of two adjacent pipe elements in a relaxed position and then tightened to a tensioned position to connect the two pipe elements together. It can be difficult for a single worker to align both pipe elements and secure the ends of the pipe elements within the coupling while tightening the coupling. Often multiple workers cooperate to couple the pipe elements together which can reduce efficiency and increase the man hours required to assemble the piping system.

SUMMARY

It is to be understood that this summary is not an extensive overview of the disclosure. This summary is exemplary and not restrictive, and it is intended to neither identify key or critical elements of the disclosure nor delineate the scope thereof. The sole purpose of this summary is to explain and exemplify certain concepts of the disclosure as an introduction to the following complete and extensive detailed description.

Disclosed is a pipe fitting configured for engagement with a coupling, the pipe fitting comprising a first end, the pipe fitting defining a raised lip at the first end; and a second end disposed opposite from the first end, the pipe fitting defining a groove between the raised lip and the second end.

Also disclosed is a pre-assembled coupling assembly comprising a coupling, the coupling defining a coupling bore extending through the coupling, the coupling comprising a gasket disposed within the coupling bore, the gasket being relaxed and uncompressed when the coupling is in a relaxed position; and a pipe fitting, the pipe fitting defining a first end and a second end, the first end inserted into the coupling bore, the coupling retained on the first end of the pipe fitting when the coupling is in the relaxed position.

Also disclosed is a method for using a pre-assembled coupling assembly, the method comprising providing a pipe fitting defining an inner end and an outer end, the pipe fitting defining an axis; axially inserting the inner end of the pipe fitting into a gasket, a portion of the pipe fitting within the gasket positioned radially outward from a portion of the gasket; and assembling a housing around the gasket, the housing and the gasket comprising a coupling, the coupling retained on the inner end of the pipe fitting when the coupling is in a relaxed position.

Various implementations described in the present disclosure may include additional systems, methods, features, and advantages, which may not necessarily be expressly disclosed herein but will be apparent to one of ordinary skill in the art upon examination of the following detailed description and accompanying drawings. It is intended that all such systems, methods, features, and advantages be included within the present disclosure and protected by the accompanying claims. The features and advantages of such implementations may be realized and obtained by means of the systems, methods, features particularly pointed out in the appended claims. These and other features will become more fully apparent from the following description and appended claims, or may be learned by the practice of such exemplary implementations as set forth hereinafter.

BRIEF DESCRIPTION OF THE DRAWINGS

The features and components of the following figures are illustrated to emphasize the general principles of the present disclosure. The drawings are not necessarily drawn to scale. Corresponding features and components throughout the figures may be designated by matching reference characters for the sake of consistency and clarity.

FIG. 1 is an end view of a pre-assembled coupling assembly comprising two couplings and a pipe fitting defining a raised-lip pipe in accordance with one aspect of the present disclosure.

FIG. 2 is a cross-sectional side view of the pre-assembled coupling assembly of FIG. 1 taken along line 2-2 shown in FIG. 1.

FIG. 3 is end view of a raised-lip end of the raised-lip pipe of FIG. 1.

FIG. 4 is a detailed cross-sectional side view of the raised-lip end of the raised-lip pipe of FIG. 1 taken along line 4-4 shown in FIG. 3.

FIG. 5A is an exploded perspective view of another aspect of the pre-assembled coupling assembly wherein the pipe fitting defines an elbow fitting in accordance with another aspect of the present disclosure.

FIG. 5B is an end view of the pre-assembled coupling assembly of FIG. 5A.

FIG. 5C is a cross-sectional side view of the pre-assembled coupling assembly of FIG. 5A taken along line 5C-5C shown in FIG. 5B.

FIG. 6A is a perspective view of the elbow fitting of FIG. 5A.

FIG. 6B is an end view of the elbow fitting of FIG. 5A.

FIG. 6C is a cross-sectional side view of the elbow fitting of FIG. 5A taken along line 6C-6C shown in FIG. 6B.

FIG. 7 is a detailed cross-sectional side view of the pre-assembled coupling assembly of FIG. 5A with a pipe in accordance with another aspect of the present disclosure.

FIG. 8A is a detailed cross-sectional side view of a first raised-lip end of the pre-assembled coupling assembly of FIG. 5A and the pipe of FIG. 7 shown with the coupling in a tensioned position.

FIG. 8B is a detailed cross-sectional side view of the first raised-lip end of the pre-assembled coupling assembly of FIG. 5A and the pipe of FIG. 7 shown with the coupling in a relaxed position.

FIG. 9 is a detailed cross-sectional view of a pressure relief channel of the elbow fitting of FIG. 5A taken along line 9-9 shown in FIG. 6B.

FIG. 10 is a detailed cross-sectional view of another aspect of the pressure relief channel in accordance with another aspect of the present disclosure.

FIG. 11 is a cross-sectional view of the pipe of FIG. 7 with another aspect of the pre-assembled coupling assembly wherein the elbow fitting defines a secondary key in accordance with another aspect of the present disclosure.

FIG. 12 is a cross-sectional view of the pipe of FIG. 7 with another aspect of the pre-assembled coupling assembly with another aspect of the elbow fitting in accordance with another aspect of the present disclosure wherein the elbow fitting is a recessed elbow fitting.

FIG. 13 is a cross-sectional side view of another aspect of the pre-assembled coupling assembly comprising another aspect of the coupling wherein the coupling comprises a C-style gasket in accordance with another aspect of the present disclosure.

FIG. 14 is a cross-sectional view of the pipe of FIG. 7 with another aspect of the pre-assembled coupling assembly comprising another aspect of the coupling wherein the gasket is a modified rimmed gasket, and another aspect of the elbow fitting in accordance with another aspect of the present disclosure, wherein the elbow fitting is a grooved elbow fitting.

FIG. 15A is a perspective view of another aspect of the pipe fitting defining a weldolet in accordance with another aspect of the present disclosure.

FIG. 15B is an end view of the weldolet of FIG. 15A.

FIG. 15C is a cross-sectional side view of the weldolet of FIG. 15A taken along line 15C-15C shown in FIG. 15B.

FIG. 16A is a perspective view of another aspect of the pipe fitting defining a mechanical tee in accordance with another aspect of the present disclosure.

FIG. 16B is an end view of the mechanical tee of FIG. 16A.

FIG. 16C is a side view of the mechanical tee of FIG. 16A.

FIG. 17A is a perspective view of another aspect of the pipe fitting defining a tee fitting in accordance with another aspect of the present disclosure.

FIG. 17B is an end view of the tee fitting of FIG. 17A.

FIG. 17C is a cross-sectional side view of the tee fitting of FIG. 17A taken along line 17C-17C shown in FIG. 17B.

FIG. 18A is a perspective view of another aspect of the pipe fitting defining an end-of-line elbow in accordance with another aspect of the present disclosure.

FIG. 18B is an end view of the end-of-line elbow of FIG. 18A facing a raised-lip end of the end-of-line elbow.

FIG. 18C is an end view of the end-of-line elbow of FIG. 18A facing a socket end of the end-of-line elbow.

FIG. 18D is a cross-sectional side view of the end-of-line elbow of FIG. 18A taken along line 18D-18D shown in FIG. 18C.

FIG. 19A is a perspective view of another aspect of the pre-assembled coupling assembly wherein the pipe fitting defines a check valve in accordance with another aspect of the present disclosure.

FIG. 19B is a cross-sectional side view of the pre-assembled coupling assembly of FIG. 19A.

FIG. 20A is a perspective view of another aspect of the pre-assembled coupling assembly wherein the pipe fitting defines a disc valve in accordance with another aspect of the present disclosure.

FIG. 20B is a cross-sectional side view of the pre-assembled coupling assembly of FIG. 20A.

FIG. 21A is a perspective view of another aspect of the pre-assembled coupling assembly wherein the pipe fitting defines a ball valve in accordance with another aspect of the present disclosure.

FIG. 21B is a side view of the pre-assembled coupling assembly of FIG. 21A showing a partial cross-section.

FIG. 21C is a detailed cross-sectional side view of the pre-assembled coupling assembly of FIG. 21A taken from Detail 21C shown in FIG. 21B.

FIG. 22A is a perspective view of another aspect of the pre-assembled coupling assembly wherein the pipe fitting defines a flanged fitting in accordance with another aspect of the present disclosure.

FIG. 22B is a cross-sectional side view of the pre-assembled coupling assembly of FIG. 22A.

FIG. 23A is a perspective view of another aspect of the elbow fitting wherein each of the raised-lip ends is a stop lip end in accordance with another aspect of the present disclosure.

FIG. 23B is a side view of the elbow fitting of FIG. 23A.

FIG. 23C is a cross-sectional detail view of the stop lip end taken along line 23C-23C shown in FIG. 23A.

FIG. 24A is an end view of an aspect of the pre-assembled coupling assembly comprising the elbow fitting of FIGS. 23A.

FIG. 24B is a cross-sectional detail side view of the stop lip end of the pre-assembled coupling of FIG. 24A taken along line 24B-24B shown in FIG. 24A with the pipe of FIG. 7.

FIG. 25 is a side view of the elbow fitting defining another aspect of the stop lip ends wherein the raised lip is a continuous stop lip in accordance with another aspect of the present disclosure.

DETAILED DESCRIPTION

The present disclosure can be understood more readily by reference to the following detailed description, examples, drawings, and claims, and the previous and following description. However, before the present devices, systems, and/or methods are disclosed and described, it is to be understood that this disclosure is not limited to the specific devices, systems, and/or methods disclosed unless otherwise specified, and, as such, can, of course, vary. It is also to be understood that the terminology used herein is for the purpose of describing particular aspects only and is not intended to be limiting.

The following description is provided as an enabling teaching of the present devices, systems, and/or methods in its best, currently known aspect. To this end, those skilled in the relevant art will recognize and appreciate that many changes can be made to the various aspects of the present devices, systems, and/or methods described herein, while still obtaining the beneficial results of the present disclosure. It will also be apparent that some of the desired benefits of the present disclosure can be obtained by selecting some of the features of the present disclosure without utilizing other features. Accordingly, those who work in the art will recognize that many modifications and adaptations to the present disclosure are possible and can even be desirable in certain circumstances and are a part of the present disclosure. Thus, the following description is provided as illustrative of the principles of the present disclosure and not in limitation thereof.

As used throughout, the singular forms “a,” “an” and “the” include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to “an element” can include two or more such elements unless the context indicates otherwise.

Ranges can be expressed herein as from “about” one particular value, and/or to “about” another particular value. When such a range is expressed, another aspect includes from the one particular value and/or to the other particular value. Similarly, when values are expressed as approximations, by use of the antecedent “about,” it will be understood that the particular value forms another aspect. It will be further understood that the endpoints of each of the ranges are significant both in relation to the other endpoint, and independently of the other endpoint.

For purposes of the current disclosure, a material property or dimension measuring about X or substantially X on a particular measurement scale measures within a range between X plus an industry-standard upper tolerance for the specified measurement and X minus an industry-standard lower tolerance for the specified measurement. Because tolerances can vary between different materials, processes and between different models, the tolerance for a particular measurement of a particular component can fall within a range of tolerances.

As used herein, the terms “optional” or “optionally” mean that the subsequently described event or circumstance can or cannot occur, and that the description includes instances where said event or circumstance occurs and instances where it does not.

The word “or” as used herein means any one member of a particular list and also includes any combination of members of that list. Further, one should note that conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain aspects include, while other aspects do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more particular aspects or that one or more particular aspects necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular aspect.

Disclosed are components that can be used to perform the disclosed methods and systems. These and other components are disclosed herein, and it is understood that when combinations, subsets, interactions, groups, etc. of these components are disclosed that while specific reference of each various individual and collective combinations and permutation of these may not be explicitly disclosed, each is specifically contemplated and described herein, for all methods and systems. This applies to all aspects of this application including, but not limited to, steps in disclosed methods. Thus, if there are a variety of additional steps that can be performed it is understood that each of these additional steps can be performed with any specific aspect or combination of aspects of the disclosed methods.

Disclosed is a pre-assembled coupling assembly and associated methods, systems, devices, and various apparatus. The pre-assembled coupling assembly can comprise a pipe fitting and a coupling retained on an end of the pipe fitting. It would be understood by one of skill in the art that the disclosed pre-assembled coupling is described in but a few exemplary aspects among many. No particular terminology or description should be considered limiting on the disclosure or the scope of any claims issuing therefrom.

FIG. 1 is an end view of a pre-assembled coupling assembly 100 in accordance with the present disclosure, and FIG. 2 is a cross-sectional view of the pre-assembled coupling assembly 100 of FIG. 1 taken along line 2-2 as shown in FIG. 1. Angles and dimensions shown in FIGS. 1-22B are merely exemplary and should not be viewed as limiting. The structures and components shown can be scaled upwards or downwards, reshaped, or resized in other aspects.

The pre-assembled coupling assembly 100 can comprise a pipe fitting 110 and at least one coupling 170. In some aspects, the coupling 170 can be a slip-on coupling, such as the slip-on coupling described in U.S. Pat. No. 9,194,516, issued on Nov. 24, 2015, which is hereby incorporated by reference in its entirety.

In the present aspect, the pre-assembly coupling assembly 100 can comprise two couplings 170 a,b which can be substantially the same (referred to generally hereafter as “pipe coupling 170” or “pipe couplings 170” unless individually identified). Each coupling 170 can comprise a housing 171 and a gasket 140 which can be enclosed and encircled by the respective housing 171. Each housing 171 can comprise a first segment 172 a and a second segment 172 b. The first segment 172 a can define a pair of fastener ears 174 a disposed at opposite ends of the first segment 172 a. The second segment 172 b can define a pair of fastener ears 174 b disposed at opposite ends of the second segment 172 b. A pair of fasteners 176 a,b, which can comprise nuts and bolts in some aspects, can extend through the fastener ears 174 a of the first segment 172 a and the fastener ears 174 b of the second segment 172 b to secure the first segment 172 a to the second segment 172 b.

In the present aspect, each housing 171 can be substantially circular in shape, and each of the segments 172 a,b can define a semicircular arc shape. Each housing 171 can define a coupling bore 182 extending through the housing 171 from a first end 178 a to a second end 178 b of the housing 171. Each gasket 140 can be disposed within the respective coupling bore 182. The coupling bore 182 can define an axis 101. The first segment 172 a can define a pair of shoulders 180 a disposed at opposite ends of the first segment 172 a and proximate to the respective fastener ears 174 a. The second segment 172 b can define a pair of shoulders 180 b disposed at opposite ends of the second segment 172 b and proximate to the respective fastener ears 174 b.

In the present aspect, the couplings 170 can be in a relaxed position. In the relaxed position of the couplings 170, the shoulders 180 a can be spaced apart from the shoulders 180 b, and the gasket 140 can be relaxed and uncompressed by the housing 171. The fasteners 176 a,b can be tightened to reconfigure the coupling 170 from the relaxed position to a tensioned position. In the tensioned position of the coupling 170, the shoulders 180 a of the first segment 172 a can be pressed against the shoulders 180 b of the second segment 172 b, and the gasket 140 can be compressed radially inward relative to the axis 101. In some aspects, each segment 172 a,b can be deformed by the fasteners 176 a,b, to align and engage the shoulders 180 a of the first segment 172 a with the shoulders 180 b of the second segment 172 b.

The pipe fitting 110 can extend into the coupling bore 182 of each of the couplings 170 at the first end 178 a of the housing 171 of each respective coupling 170.

In the aspect shown, the pipe fitting 110 can be a pipe 500, wherein the pipe is a raised-lip pipe 1412. The raised-lip pipe 1412 can define a standard grooved end 1402 and a raised-lip end 1404 disposed opposite from the standard grooved end 1402. The raised-lip end 1404 can define a raised lip 518. The raised lip 518 can retain the coupling 170 a on the raised-lip end 1404 with the coupling 170 a in the relaxed position due to interference between the raised lip 518 and the gasket 140 of the coupling 170 a.

The standard grooved end 1402 does not define the raised lip 518. The standard grooved end 1402 can readily be inserted and withdrawn from the coupling 170 b with the coupling 170 b in the relaxed position. In practice, the coupling 170 b can be comprised by a second pre-assembled coupling assembly 100 (not shown) comprising a second raised-lip pipe (not shown) or other pipe fitting 110. The standard grooved end 1402 of each pre-assembled coupling assembly 100 can be stabbed into the coupling 170 of an adjacent pre-assembled coupling assembly 100 and tightened to form a piping system. Similarly, a standard grooved end 1402 of a second raised-lip pipe 1412 could be stabbed into the second end 178 b of the coupling 170 a to join the raised-lip end 1404 of the present pre-assembled coupling assembly 100 to the standard grooved end 1402 of the second raised-lip pipe 1412, such as to form a pipeline.

It can be desirable for the coupling 170 a to be retained on the raised-lip end 1404 of the raised-lip pipe 1412 so that the pre-assembled coupling assembly 100 can be easily attached to a second raised-lip pipe (not shown). For example, a user can hold the second raised-lip pipe 1412 with one hand, and the pre-assembled coupling assembly 100 can be slipped over the standard grooved end 1402 of the second raised-lip pipe 1412 with a second hand of the user. Additionally, because the coupling 170 a can be retained on the raised-lip pipe 1412, the user is less likely to lose or mix up parts, such as in a field environment, because the pre-assembled coupling assembly 100 may not come apart without a deliberate effort by the user.

In some aspects, both ends of the raised-lip pipe 1412 can be raised-lip ends 1404, and both couplings 170 a,b can be retained on the respective ends of the raised-lip pipe 1412 when the couplings 170 a,b are in the relaxed position. A similar configuration is shown by an elbow fitting 2212 of FIGS. 5A-6C.

FIG. 3 is an end view of the raised-lip end 1404 of the raised-lip pipe 1412 of FIG. 1, and FIG. 4 is a cross-sectional view of the raised-lip end 1404 of the raised-lip pipe 1412 taken along line 4-4 shown in FIG. 3. In the present aspect, an outer pipe surface 504 of the raised-lip pipe 1412 can be substantially parallel with the axis 101, and a ramped surface 619 of the raised lip 518 can define a 45-degree angle with the outer pipe surface 504. In other aspects, the ramped surface 619 can be angled relative to the outer pipe surface 504 at greater or fewer than 45 degrees. In the present aspect, the raised lip 518 can extend radially outward about 0.100″ from the outer pipe surface 504; however in other aspects, the raised lip 518 can extend radially outward more than or less than 0.100″.

FIGS. 5A-C show multiple views of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be the elbow fitting 2212. FIG. 6A-C show multiple views of the elbow fitting 2212 of FIGS. 5A-C. In the aspect shown, the elbow fitting 2212 can define a first raised-lip end 2202 a and a second raised-lip end 2202 b disposed opposite from the first raised-lip end 2202 a. The first raised-lip end 2202 a can be substantially similar to the second raised-lip end 2202 b in the present aspect. In other aspects, the elbow fitting 2212 can define a standard grooved end, such as the standard grooved end 1402 shown in FIG. 2, opposite from the first raised-lip end 2202 a. The pre-assembled coupling assembly 100 can comprise a first coupling 170 a retained on the first raised-lip end 2202 a by a first raised lip 518 a and a second coupling 170 b retained on the second raised-lip end 2202 b by a second raised lip 518 b. In the present aspect, the first raised-lip end 2202 a can define a groove 514 extending radially inward into the first raised-lip end 2202 a between an outer lip 512 and the raised lip 518 a.

In the present aspect, the elbow fitting 2212 can be a 90-degree elbow. In other aspects, the elbow fitting 2212 can be a different type of elbow, such as a 45-degree elbow for example and without limitations. In other aspects, the elbow fitting 2212 can define a U-shape or any other suitable shape.

As shown, each raised-lip end 2202 a,b can define a plurality of pressure relief channels 520 defined into the respective raised lip 518. In the present aspect, each raised-lip end 2202 a,b can define four pressure relief channels 520 which can be equally circumferentially spaced around the raised lip 518. In other aspect, the raised-lip ends 2202 a,b can define greater or fewer than four pressure relief channels 520, and the pressure relief channels 520 can be distributed in any suitable configuration around the raised lip 518.

FIG. 7 is a detailed cross-sectional view of the first raised-lip end 2202 a of the pre-assembled coupling assembly 100 of FIGS. 5A-C taken along line 5C-5C as shown in FIG. 5B with a pipe 500 in accordance with another aspect of the present disclosure. In the present aspect, the pipe 500 can be a standard pipe, and the pipe end 502 can be a standard grooved end 1402. The housing 171 of the coupling 170 a can define a first ridge 578 a disposed at the first end 178 a of the housing 171 and a second ridge 578 b disposed at the second end 178 b of the housing 171. The ridges 578 a,b can extend radially inward relative to the axis 101. The housing 171 can define a gasket groove 570 within the coupling bore 182 which can be disposed between the ridges 578 a,b, and the gasket 140 can be seated within the gasket groove 570.

The gasket 140 can define a sealing ridge 548 a disposed proximate to the first end 178 a of the housing 171 and a sealing ridge 548 b disposed proximate to the second end 178 b of the housing 171. The sealing ridges 548 a,b can extend radially inward from the gasket 140 relative to the axis 101. The gasket 140 can also define a center ridge 540 disposed between the sealing ridges 548 a,b. The center ridge 540 can extend radially inward from the gasket 140, and the center ridge 540 can define a pair of ribs 550 a,b at a radially innermost end of the center ridge 540. The gasket 140 can define a sealing channel 552 a disposed between the sealing ridge 548 a and the rib 550 a and a sealing channel 552 b disposed between the sealing ridge 548 b and the rib 550 b.

The pipe 500 can define an inner pipe surface 506 and an outer pipe surface 504 disposed opposite from the inner pipe surface 506. The inner pipe surface 506 can define a pipe bore 510 extending through the pipe 500, and the pipe bore 510 can carry pressurized fluids through the piping system. A circumferential groove 508 can be defined extending radially inward into the outer pipe surface 504 relative to the axis 101. The groove 508 can be disposed proximate to the end 502 of the pipe 500. The second ridge 578 b can be configured to engage the groove 508 when the end 502 of the pipe 500 is inserted into the coupling bore 182 and the coupling 170 is in the tensioned position. When engaged with the groove 508, the second ridge 578 b secures the coupling 170 to the pipe 500 and prevents axial movement of the pipe 500 relative to the coupling 170.

The first raised-lip end 2202 a can be substantially similar to the second raised-lip end 2202 b (second raised-lip end 2202 b shown in FIG. 6C) of the elbow fitting 2212 in the present aspect. In other aspects, the raised-lip ends 2202 a,b can differ from one another. In the orientation shown, the raised-lip end 2202 a can be an inner end 516 of the pipe fitting 110 which is inserted into the coupling bore 182. The first raised-lip end 2202 a can define an outer lip 512 which can be disposed external to the coupling bore 182 when the first raised-lip end 2202 a is inserted into the coupling bore 182. The outer lip 512 can extend radially outward from the elbow fitting 2212. In the present aspect, the outer lip 512 can radially overlap with the first ridge 578 a of the housing 171 when the coupling is in the relaxed position. The outer lip 512 can provide a physical stop which can thereby prevent over-insertion of the first raised-lip end 2202 a into the coupling bore 182.

The raised lip 518 a can be disposed at the first raised-lip end 2202 a, and the raised lip 518 a can extend radially outward from the first raised-lip end 2202 a relative to the axis 101. In the present aspect, the raised lip 518 a can be disposed radially inward from the outer lip 512, therefore allowing the first raised-lip end 2202 a and the raised lip 518 a to be inserted into the coupling bore 182 with the coupling 170 in the relaxed position. In other aspects, the raised lip 518 can extend radially outwards beyond the first ridge 578 a with the coupling 170 in the relaxed position, thereby preventing insertion and removal of the inner end 516 from the coupling bore 182. In such aspects, the first segment 172 a and the second segment 172 b of the housing 171 can be assembled around the first raised-lip end 2202 a of the elbow fitting 2212 to capture the first raised-lip end 2202 a within the coupling bore 182. In such aspects, the inner end 516 of the elbow fitting 2212 may not be removed from the coupling bore 182 without disassembling the housing 171.

The raised lip 518 can be sized to radially interfere with the sealing ridge 548 a of the gasket 140 when the gasket 140 is in the relaxed and uncompressed state. For example, a radially outermost portion of the raised lip 518 can be disposed radially outward from a radially innermost portion of the sealing ridge 548 a when the raised lip 518 is axially positioned between the sealing ridges 548 a,b relative to the axis 101. The gasket 140 can comprise an elastic material, such as a rubber, a polymer, an elastomer, or any other suitable material, and the gasket 140 can be flexible and resilient.

Interference between the raised lip 518 and the sealing ridge 548 a can prevent accidental removal of the first raised-lip end 2202 a of the elbow fitting 2212 from the coupling bore 182 when the coupling 170 a is in the relaxed position. The sealing ridge 548 a can stretch over the raised lip 518 when the first raised-lip end 2202 a is inserted into or withdrawn from the coupling bore 182. In the present aspect, the sealing ridge 548 a can be in a relaxed state when the coupling 170 is in the relaxed position, and the sealing ridge 548 a is axially positioned between the raised lip 518 and the outer lip 512 of the first raised-lip end 2202 a relative to the axis 101.

In the present aspect, the first raised-lip end 2202 a of the elbow fitting 2212 can be withdrawn from the coupling bore 182 of the coupling 170 a with a deliberate force when the coupling 170 a is in the relaxed position. By exerting the deliberate force, the sealing ridge 548 a can stretch over the raised lip 518 to allow the elbow fitting 2212 to be removed from the coupling 170 a. The resistance provided by the sealing ridge 548 a can be optimized to prevent accidental disassembly of the pre-assembled coupling assembly 100 while still allowing for deliberate disassembly of the pre-assembled coupling assembly 100 without undue difficulty. For example, with the coupling 170 a in the relaxed position, the pre-assembled coupling assembly 100 can be disassembled with the fingers of a user possessing typical hand strength without the need for tools while also resisting separation of the coupling 170 a from the elbow fitting 2212 by the force of gravity and general handling of the pre-assembled coupling assembly 100. For example, the coupling 170 a and the elbow fitting 2212 can resist separation if a user carries the pre-assembled coupling assembly 100 without supporting both the coupling 170 a and the elbow fitting 2212.

In the present aspect, the first raised-lip end 2202 a can define a groove 514 extending radially inward into the first raised-lip end 2202 a between the outer lip 512 and the raised lip 518. The groove 514 can be configured to receive the first ridge 578 a of the housing 171 when the coupling 170 a is in the tensioned position. Engagement between the first ridge 578 a and the groove 514 can secure the elbow fitting 2212 to the coupling 170 a and prevent the first raised-lip end 2202 a of the elbow fitting 2212 from being withdrawn from the coupling bore 182 when the coupling 170 a is in the tensioned position.

The raised lip 518 can define at least one pressure relief channel 520 defined at the first raised-lip end 2202 a of the elbow fitting 2212. The pressure relief channel 520 can extend through the raised lip 518 as shown and further described with respect to FIGS. 9 and 10 below.

FIG. 8A is a detailed cross-sectional view of the pipe 500, the elbow fitting 2212, and the coupling 170 a of FIG. 7 with the coupling 170 a in the tensioned position and with the pre-assembled coupling assembly 100 in a pressurized condition in which fluid is allowed to flow into the pipe 500 to apply fluid pressure to the elbow fitting 2212 and the gasket 140. In the tensioned position, the gasket 140 can be compressed radially inward to form seals with the pipe 500 and the elbow fitting 2212. The sealing ridge 548 a can form a seal with a sealing surface 612 defined by the first raised-lip end 2202 a of the elbow fitting 2212. In the present aspect, the sealing surface 612 can be defined between the raised lip 518 a and the groove 514, and the raised lip 518 a can extend radially outward from the sealing surface 612. The sealing ridge 548 b can form a seal with a sealing portion 604 of the outer pipe surface 504 of the pipe 500 defined between the groove 508 and the end 502 of the pipe 500.

The raised lip 518 a can also define a ramped surface 619. The ramped surface 619 can be angled, as shown in FIG. 8A, thereby taking the shape of a truncated cone, or can be curved in other aspects. The angle or curve of the ramped surface 619 can be configured to guide the sealing ridge 548 a into position around the sealing surface 612 as the first raised-lip end 2202 a is inserted into the coupling 170 a, and the gasket 140 can also be configured to prevent removal of the gasket 140 from over the raised lip 518 a when the gasket 140 is in the relaxed position.

The outer lip 512 can also define a ramped surface 613 facing axially towards the pipe 500. The ramped surface 613 can also define a side of the groove 514 axially outward from the coupling 170 a. The ramped surface 613 can be angled, as shown in FIG. 8A, thereby taking the shape of a truncated cone, or can be curved in other aspects, and can extend to a bottom of the groove 514. The angle or curve of the ramped surface 613 can be configured to guide the first ridge 578 a into position in the groove 514 when the coupling 170 a is tightened into the tensioned position. The ramped surface 613 can thereby function as a locating feature to allow the user to ensure that the coupling 170 a is properly positioned over the first raised-lip end 2202 a of the elbow fitting 2212 and, when the pipe 500 is inserted into the coupling 170 a to abut the first raised-lip end 2202 a, as shown in FIG. 8B, the coupling 170 a is likewise properly positioned over the pipe 500 such that the second ridge 578 b is aligned over the groove 508. Thus, when the coupling 170 a is tightened into the tensioned position, the second ridge 578 b can be properly guided into the groove 508. In various aspects, the groove 514 can be narrower in the axial direction than the groove 508 so that the second ridge 578 b can be spaced slightly in the axial direction from sides of the groove 508. This can ensure that the second ridge 578 b properly seats into the groove 508 without inadvertently contacting sides of the groove 508 when the coupling 170 a is tightened.

Further, the grooves 508,514 of the pipe 500 and the first raised-lip end 2202 a, respectively, can each define side stop surfaces 609,615, respectively. The side stop surfaces 609,615 act as stops to prevent the pipe 500 and the elbow fitting 2212, respectively, from being removed from the coupling 170 a when the coupling 170 a is in the tensioned position by engaging the ridges 578 a,b when either or both of the pipe 500 and the elbow fitting 2212 are pushed or pulled axially outward from the coupling 170 a, such as when the pre-assembled coupling assembly 100 is in the pressurized condition.

FIG. 8A also shows that portions of the first segment 172 a and, similarly, the second segment 172 b (shown in FIG. 7) can contact the outer surfaces 504 of the pipe 500 and the elbow fitting 2212 adjacent to the grooves 508,514, respectively, when the coupling 170 a is in the tensioned condition. However, in other aspects, the segments 172 a,b may contact only one or both of the grooves 508,514, or contact the groove 508 and the outer surface of the elbow fitting 2212 adjacent to the groove 514, or contact the groove 514 and the outer surface 504 of the pipe 500 adjacent to the groove 508.

In the tensioned position, the center ridge 540 can be compressed radially inward, and the rib 550 a can contact the raised lip 518 a. In some aspects, the rib 550 a can form a secondary seal with the raised lip 518 a. In the present aspect, the pressure relief channel 520 can maintain fluid communication between the sealing channel 552 a and the pipe bore 510. By maintaining fluid communication between the sealing channel 552 a and the pipe bore 510, pressurized fluids carried by the pipe 500 can exert pressure within the sealing channel 552 a which can energize the seal formed between the sealing ridge 548 a and the sealing surface 612 of the first raised-lip end 2202 a. The sealing channel 552 a can define a U-shape of the sealing ridge 548 a, and pressure exerted within the sealing channel 552 a can press an axially inner end 648 a of the sealing ridge 548 a against the sealing surface 612. The sealing ridge 548 b can function similarly, and pressurized fluids within the sealing channel 552 b can press an axially inner end 648 b of the sealing ridge 548 b against the sealing portion 604 of the outer pipe surface 504 of the pipe 500 to energize the seal between the sealing ridge 548 b and the pipe 500.

FIG. 8B is a detailed cross-sectional view of the pipe 500, the elbow fitting 2212, and the coupling 170 a of FIG. 7 with the coupling 170 a in the relaxed position with the pipe 500 inserted into the coupling 170 a and abutting the first raised-lip end 2202 a. The cross-section of FIG. 8B is taken from a sectional line extending through mid-sections of the first segment 172 a and the second segment 172 b (shown in FIG. 7). When the pipe 500 is inserted into pre-assembled coupling assembly 100 with a pipe fitting 110, the end 502 of the pipe 500 abuts an inner end of the pipe fitting 110, such as the first raised-lip end 2202 a in this aspect. With the ramped surface 619 preventing withdrawal from the gasket 140 and thereby the coupling 170 a, and with the ramped surface 613 preventing further insertion of the first raised-lip end 2202 a into the coupling 170 a, the pipe 500 can thereby be held in position to locate the second ridge 578 b over the groove 508. In the current aspect, the sealing ridge 548 a can also be in contact with the sealing surface 612 when the coupling 170 a is in the relaxed position, further holding the first raised-lip end 2202 a in the coupling 170 a.

As shown in FIG. 8B, in some aspects, the bottom of the groove 514 can define a smaller diameter than a bottom of the groove 508. This can provide the benefit of the second ridge 578 b rigidly contacting the pipe 500 before the first ridge 578 a contacts the elbow fitting 2212, ensuring that the coupling 170 a is rigidly attached to the pipe 500. The sealing surface 612 of the first raised-lip end 2202 a can also define a larger diameter than the sealing portion 604 of the pipe 500, which can better hold the gasket 140, and thereby the coupling 170 a, on the elbow fitting 2212. The diameter of the sealing surface 612 can be sized such that the gasket 140 contacts the sealing surface 612 in the relaxed position, or can be sized such that the gasket 140 does not contact the sealing surface 612 in the relaxed position but is closer to the gasket 140 than the sealing portion 604.

FIG. 9 is a detail cross-sectional view of a one of the pressure relief channels 520 of FIGS. 6A-C taken along line 9-9 shown in FIG. 6B. The pressure relief channel 520 can comprise an angled surface 1020 and an axial surface 1018. The angled surface 1020 can be angled relative to the first raised-lip end 2202 a of the elbow fitting 2212 and relative to the sealing surface 612. In the present aspect, the angled surface 1020 can define an about 30-degree angle with the first raised-lip end 2202 a of the elbow fitting 2212; however in other aspects, the angle can be larger or smaller than 30 degrees. The axial surface 1018 can be substantially parallel to the axis 101 (shown in FIG. 7) and the sealing surface 612. The axial surface 1018 can be defined radially outward from the sealing surface 612 of the first raised-lip end 2202 a of the elbow fitting 2212 and radially inward from the raised lip 518 (also shown in FIGS. 5A-C).

The raised lip 518 can define a rounded transition surface 1016 defined at the first raised-lip end 2202 a of the elbow fitting 2212. The raised lip 518 can define the ramped surface 619 extending to the sealing surface 612. In the present aspect, the ramped surface 619 can define an about 45-degree angle with the sealing surface 612; however, in other aspects, the angle can be greater or smaller than 45 degrees.

FIG. 10 is a detail cross-sectional view of another aspect of the pressure relief channels 520 of FIG. 6A-C taken along line 9-9 shown in FIG. 6B. Rather than defining the angled surface 1020 as shown in FIG. 9, the pressure relief channel 520 can define a radial surface 1120, which can be substantially perpendicular to the axis 101 (shown in FIG. 7) and the axial surface 1018. In the present aspect, the radial surface 1120 can be substantially parallel to the first raised-lip end 2202 a of the elbow fitting 2212. In the present aspect, the radial surface 1120 can extend completely across the first raised-lip end 2202 a of the elbow fitting 2212.

FIG. 11 shows another aspect of the pre-assembled coupling assembly 100 wherein the elbow fitting 2212 can define a secondary key 1378 extending radially outward from a cylindrical portion 1314 of the elbow fitting 2212 defined proximate to the inner end 516 of the elbow fitting 2212. The secondary key 1378 can be disposed adjacent to the groove 514, and the groove 514 can be disposed between the secondary key 1378 and the inner end 516. In the present aspect, the inner end 516 may not define the raised lip 518 (shown in FIG. 10) and may be a plain grooved end, similar to the standard grooved end 1402 of the raised-lip pipe 1412 of FIG. 2.

The coupling 170 a can comprise a grooved housing 1371 comprising another aspect of the first segment 172 a and the second segment 172 b. The grooved housing 1371 can define a secondary shoulder 1370 attached to the first ridge 578 a. A secondary groove 1372 can be defined between the secondary shoulder 1370 and the first ridge 578 a. The secondary key 1378 can be received within the secondary groove 1372 to retain the coupling 170 a on the elbow fitting 2212.

During assembly, the coupling 170 a in the relaxed position can be slipped over the end 502 of the pipe 500, and the end 502 can be positioned in facing engagement with the inner end 516 of the elbow fitting 2212. With the end 502 in facing engagement with the inner end 516, the secondary key 1378 can be positioned adjacent to the first ridge 578 a. Once the coupling 170 a is in the tensioned position and the pipe 500 is pressurized, the inner end 516 of the elbow fitting 2212 can pull away from the end 502 of the pipe 500 due to end cap forces from pressurized fluids transmitted by the pipe 500. Contact between the secondary key 1378 and the secondary shoulder 1370 can limit axial movement of the elbow fitting 2212 relative to the coupling 170 a and the pipe 500.

FIG. 12 shows a cross-sectional side view of another aspect of the pre-assembled coupling assembly 100. The pipe fitting 110 can be a recessed elbow fitting 3012. The recessed elbow fitting 3012 can be similar to the elbow fitting 2212 except that the recessed elbow fitting 3012 can define a recessed raised-lip end 3002 in place of the raised-lip ends 2202 a,b (shown in FIG. 2). The outer lip 512 can be disposed axially outward from the coupling 170 a with respect to the axis 101. The recessed elbow fitting 3012 can define a shoulder 3060 disposed between the sealing surface 612 and the raised lip 518. The shoulder 3060 can extend radially inward from the sealing surface 612 with respect to the axis 101. The recessed elbow fitting 3012 can further define a groove 3014 axially disposed between the raised lip 518 and the shoulder 3060 with respect to the axis 101. The groove 3014 can extend radially inward from the raised lip 518 with respect to the axis 101.

In the present aspect, the raised lip 518 can be a recessed raised lip 3018 disposed radially inward from the sealing surface 612 with respect to the axis 101. The pressure relief channels 520 can be recessed pressure relief channels 3020 which can radially extend through the recessed raised lip 3018 and can axially extend between the recessed raised-lip end 3002 and the shoulder 3060 with respect to the axis 101.

In the present aspect, the gasket 140 can be a rimmed gasket 3040. The rimmed gasket 3040 can define an inner rim 3050 which can extend radially inward from the center ridge 540 of the rimmed gasket 3040. The inner rim 3050 can define a radially inner end 3052. With the recessed raised-lip end 3002 disposed within the coupling bore 182, the inner rim 3050 can be positioned adjacent to the shoulder 3060. The radially inner end 3052 of the inner rim 3050 can be received within the groove 3014 of the recessed elbow fitting 3012, and the recessed raised lip 3018 can radially overlap with the radially inner end 3052 of the inner rim 3050 with respect to the axis 101. Radial overlap of the recessed raised lip 3018 and the radially inner end 3052 can retain the coupling 170 a on the recessed elbow fitting 3012 when the coupling 170 a is in the relaxed position.

The end 502 of the pipe 500 can also be inserted into the coupling bore 182 with the coupling 170 a in the relaxed position. With the end 502 of the pipe 500 disposed within the coupling bore 182, the inner rim 3050 can extend axially inwards from the rimmed gasket 3040 between the end 502 of the pipe 500 and the shoulder 3060, thereby preventing contact between the end 502 of the pipe 500 and the shoulder 3060. The recessed raised-lip end 3002 can be inserted into the end 502 of the pipe 500. The recessed raised lip 3018 can define a tapered pipe alignment surface which can facilitate insertion of the recessed raised-lip end 3002 of the recessed elbow fitting 3012 into the end 502 of the pipe 500.

FIG. 13 shows a cross-sectional side view of another aspect of the pre-assembled coupling assembly 100. The coupling 170 a of the present aspect of the pre-assembled coupling assembly 100 can comprise a C-style gasket 3140 which may not define the center ridge 540 (shown in FIG. 7) of the gasket 140 (shown in FIG. 7). The C-style gasket 3140 can define a pair of sealing ridges 3148 a,b. In the present aspect, the sealing ridges 3148 a,b can extend axially and radially inward relative to the axis 101, as demonstrated by sealing ridge 3148 b, when the C-style gasket 3140 is in a relaxed and uncompressed state. Once the end 502 of the pipe 500 (not shown) is inserted into the coupling 170 a, the sealing ridge 3148 b can stretch over the end 502 of the pipe 500 and rotate radially outward with respect to the axis 101.

FIG. 14 shows a cross-sectional side view of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be a grooved elbow fitting 3212. The grooved elbow fitting 3212 can define an inner end 3202, and a circumferential groove 3222 can be defined at the inner end 3202, and the circumferential groove 3222 can extend around a circumference of the grooved elbow fitting 3212. The circumferential groove 3222 can be defined extending radially inward from the sealing surface 612. In the present aspect, the circumferential groove 3222 can define a triangular cross-sectional shape; however in other aspects, the circumferential groove 3222 can define a different cross-sectional shape, such as semi-circular, rectangular, or any other suitable shape. In the present aspect, the raised lip 518 can be a recessed raised lip 3218 disposed radially inward from the sealing surface 612 with respect to the axis 101. The inner end 3202 can also define pressure relief channels 3220 extending radially through the inner end 3202 and intersecting the circumferential groove 3222 with respect to the axis 101. With the end 502 of the pipe 500 inserted into the coupling 170 a, the end 502 of the pipe 500 can contact the inner end 3202 of the grooved elbow fitting 3212.

The coupling 170 a can comprise a modified rimmed gasket 3240 which can define an inner rim 3250 which can extend radially inward from the center ridge 540 with respect to the axis 101. A radially inner end 3252 of the inner rim 3250 can define a cross-sectional shape formed complimentary to the cross-sectional shape of the circumferential groove 3222. In the present aspect, the radially inner end 3252 can define the triangular cross-sectional shape for example and without limitation. The radially inner end 3252 of the inner rim 3250 can engage the circumferential groove 3222, and engagement between the radially inner end 3252 and the circumferential groove 3222 can retain the coupling 170 a on the inner end 3202 of the grooved elbow fitting 3212 when the coupling 170 a is in the relaxed position.

FIGS. 15A-C show multiple views of another aspect of the pipe fitting 110 wherein the pipe fitting 110 can be a weldolet 1812. The weldolet 1812 can define a raised-lip end 1802 disposed opposite from a coped end 1804. The raised-lip end 1802 can define the raised lip 518 and the pressure relief channels 520. The coped end 1804 can define a coped profile 1808 configured to match a radius of curvature of a pipe (not shown). The coped end 1804 can also define a beveled edge 1806, and the weldolet 1812 can be configured to attach to an outer surface of the pipe (not shown), such as by welding, in order to attach a nipple for the pipe (not shown). A coupling, such as the coupling 170 a of FIG. 1, can be slipped over the raised-lip end 1802 and retained by the raised lip 518 to form another aspect of the pre-assembled coupling assembly 100. The weldolet 1812 can define a secondary key 1818, similar to the secondary key 1378 shown in FIG. 11, which can act as a stop for the coupling 170 a when the raised-lip end 1802 of the weldolet 1812 is inserted into the coupling 170 a. In some aspects, the coupling 170 can receive the secondary key 1378 in a secondary groove (not shown) which can be similar to the secondary groove 1372 of the coupling 170 of the aspect of FIG. 11.

FIGS. 16A-C show multiple views of another aspect of the pipe fitting 110 wherein the pipe fitting 110 can be a mechanical tee 1912. The mechanical tee 1912 can define a saddle 1906 configured to fit around an outer pipe surface of a pipe (not shown). The saddle 1906 can define a pair of fastener holes 1908 which can receive fasteners (not shown) to secure the mechanical tee 1912 to the other pipe. The mechanical tee 1912 can define a raised-lip end 1902 disposed opposite from the saddle 1906. In the present aspect, the mechanical tee 1912 can define a coped end 1904 disposed opposite from the raised-lip end 1902 which can extend downwards between the saddle 1906. The coped end 1904 can be received by a hole (not shown) defined by the pipe, and the mechanical tee 1912 can be secured and sealed to the other pipe to provide a tee connection. A coupling, such as the coupling 170 a of FIG. 1, can be attached to the raised-lip end 1902 and retained by the raised lip 518 to form another aspect of the pre-assembled coupling assembly 100.

FIGS. 17A-C show multiple views of another aspect of the pipe fitting 110 wherein the pipe fitting 110 can be a tee fitting 2412. The tee fitting 2412 can define three secondary keys 1818 a,b,c and three raised-lip ends 2402 a,b,c, respectively defining the raised lips 518 a,b,c. The raised-lip ends 2402 a,b can be disposed opposite from one another on the tee fitting 2412, and the raised-lip end 2402 c can extend outwards substantially perpendicular to the raised-lip ends 2402 a,b. In other aspects, one or more of the raised-lip ends 2402 a,b,c can be a standard grooved end, such as the standard grooved end 1402 shown in FIG. 2, in place of a raised-lip end 2402. Couplings 170, as shown in FIG. 1, can be slipped over any or all of the raised-lip ends 2402 a,b,c and retained by the respective raised lips 518 a,b,c to form another aspect of the pre-assembled coupling assembly 100.

FIGS. 18A-D shows multiple views of another aspect of the pipe fitting 110 wherein the pipe fitting 110 can be an end-of-line elbow 2512. The end-of-line elbow 2512 can define a raised-lip end 2502 and a socket end 2504. The socket end 2504 can define a socket 2506. The socket 2506 can be a threaded socket which can be configured to receive a threaded plug, a threaded pipe end, a hose connection, or any other suitable threaded fitting in the present aspect. In other aspects, the socket 2506 can be a tapered socket, as commonly used with polyvinyl chloride (PVC) piping for example and without limitation, or a weld socket, as commonly used with socket-weld pipe connections. The raised-lip end 2502 can define the raised lip 518. A coupling 170, as shown in FIG. 1, can be slipped over the raised-lip end 2502 and retained by the raised lip 518 to form another aspect of the pre-assembled coupling assembly 100.

FIGS. 19A-B show multiple views of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be a check valve 2612. In the present aspect, the check valve 2612 can define a pair of raised-lip ends 2602 a,b and a pair of secondary keys 1818 a,b. The raised-lip end 2602 a can be disposed opposite from the raised-lip end 2602 b on the check valve 2612. In other aspects, a one of the raised-lip ends 2602 a,b can be a standard grooved end, such as the standard grooved end 1402 shown in FIG. 2. Each raised-lip end 2602 a,b can respectively define the raised lip 518 a,b. The couplings 170 a,b, and their respective gaskets 140 a,b, can be positioned and retained on the raised-lip ends 2602 a,b, respectively.

FIGS. 20A-B shows multiple views of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be a disc valve 2712. In the present aspect, the disc valve 2712 can define a pair of raised-lip ends 2702 a,b. The raised-lip end 2702 a can be disposed opposite from the raised-lip end 2702 b on the disc valve 2712. In other aspects, a one of the raised-lip ends 2702 a,b can be a standard grooved end, such as the standard grooved end 1402 shown in FIG. 14. Each raised-lip end 2702 a,b can respectively define the raised lip 518 a,b. The couplings 170 a,b, and their respective gaskets 140 a,b, can be positioned and retained on the raised-lip ends 2702 a,b, respectively.

FIGS. 21A-C show multiple views of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be a ball valve 2812. In the present aspect, the ball valve 2812 can define a pair of raised-lip ends, as represented by the raised-lip end 2802. The raised-lip end 2802 can respectively define the raised lip 518. The couplings 170 a,b can be positioned and retained on the raised-lip ends, respectively. As shown in FIG. 21C, the coupling 170 b can comprise the gasket 140 b.

FIGS. 22A-B show multiple views of another aspect of the pre-assembled coupling assembly 100 wherein the pipe fitting 110 can be a flanged fitting 2912. The flanged fitting 2912 can define a raised-lip end 2902 and a flanged end 2904. The flanged end 2904 can define a flange 2906 configured to couple with a flange (not shown) of another pipe fitting (not shown). The raised-lip end 2902 can define the raised lip 518. In the relaxed position, the coupling 170 can be retained on the raised-lip end 2902 by interference between the raised lip 518 and the gasket 140.

FIG. 23A is a perspective view of another aspect of the elbow fitting 2212 wherein each of the raised-lip ends 2002 a,b is a stop lip end 1712 a,b, respectively, in accordance with another aspect of the present disclosure. FIG. 23B is a side view of the elbow fitting 2012 of FIG. 23A. On the elbow fitting 2012, each of the raised lips 518 a,b can be a stop lip 1718 a,b. The stop lips 1718 a,b can be spaced inward towards the adjacent outer lip 512 and away from the respective stop lip end 1712 a,b. The pressure relief channels 520 can also be defined by circumferential gaps 1720 in the respective stop lips 1718 a,b in the present aspect.

FIG. 23C is a cross-sectional detail view of the stop lip end 1712 a taken along line 23C-23C shown in FIG. 23A. The stop lip end 1712 a can also be representative of the stop lip end 1712 b. The stop lip end 1712 a can define a bore 1790, and the bore 1790 can define an axis 1701. Unlike the raised lips 518 a,b of the aspects of the elbow fitting 2212 of FIGS. 5A-8B, in this aspect, the raised lip 518 a, stop lip 1718 a, does not extend to the stop lip end 1712 a, itself. Instead, a step surface 1716 can be defined between the stop lip 1718 a and the stop lip end 1712 a. In the present aspect, the step surface 1716 can be a cylindrical surface. In the present aspect, the step surface 1716 can be radially aligned with the sealing surface 612; however in other aspects, the step surface 1716 can be defined radially inward or radially outward from the sealing surface 612. In the present aspect, the step surface 1716 can be defined radially outward from the groove 514 but radially inward from the stop lip 1718 a and the outer lip 512. In the present aspect, the stop lip 1718 a can extend radially outwards even with the outer lip 512; however in other aspects, the stop lip 1718 a can extend radially outwards beyond the outer lip 512.

The stop lip 1718 a can define an outer surface 1719 a facing the outer lip 512 and an inner surface 1719 b facing the stop lip end 1712 a of the elbow fitting 2212. The outer surface 1719 a can define an outer angle A₁ relative to a radial direction of the axis 1701, and the inner surface 1719 b can define an inner angle A₂ relative to the radial direction of the axis 1701. In the present aspect, each of the angles A₁,A₂ can be less than 45 degrees. In some aspects, the angles A₁,A₂ can be 0 degrees, and the inner surface 1719 a and the outer surface 1719 b can be parallel to the radial direction of the axis 1701.

FIG. 24A is an end view of an aspect of the pre-assembled coupling assembly 100 comprising the elbow fitting 2212 of FIGS. 23A-C. FIG. 24B is a cross-sectional detail side view of the stop lip end 1712 a of the pre-assembled coupling 100 of FIG. 24A taken along line 24B-24B shown in FIG. 24A with the pipe 500 of FIG. 7. In the present aspect, the stop lip 1718 a can be specifically shaped to prevent insertion and withdrawal of the stop lip end 1712 a of the elbow fitting 2212 into the coupling bore 182 when the coupling 170 a is in the relaxed position. For example, the stop lip 1718 a can extend radially outward far enough to radially overlap with the ridge 578 a. Consequently, if a user attempts to insert the stop lip end 1712 a into the coupling bore 182 in the relaxed state or remove the stop lip end 1712 a from the coupling bore 182 in the relaxed state, interference between the stop lip 1718 a and the ridge 578 a will prevent the user from succeeding. Instead, the user must disassemble the coupling 170 a by separating the first segment 172 a from the second segment 172 b of the housing 171 to insert or remove the stop lip end 1712 a from the coupling bore 182. Therefore, to assemble the pre-assembled coupling 100, the user must first insert the stop lip end 1712 a into the gasket 140 and then assembled the housing 171 around the gasket 140 in the present aspect. In some aspects, the stop lip end 1712 a cannot be stabbed into the gasket 140 without a tool to aid in expanding the sealing ridge 548 a over the stop lip 1718 a, particularly in aspects wherein the inner angle A₂ (shown in FIG. 23C) approaches a very small value, such as less than 10 degrees.

FIG. 25 is a side view of the elbow fitting 2212 defining another aspect of the stop lip ends 1712 a,b wherein the raised lip 518 is a continuous stop lip 1918 a,b which does not define the circumferential gaps 1720 (shown in FIG. 23A).

To pre-assemble the pre-assembled coupling assembly 100, the inner end 516 of the pipe fitting 110 can be inserted into a relaxed gasket 140, without the housing 171 assembled around the gasket 140,3140 so that the inner end 516 can be axially positioned between the sealing ridges 548 a,b,3148 a,b. In some aspects, the sealing ridge 548 a can contact the sealing surface 612 of the pipe fitting 110. As discussed above, in aspects defining the stop lip 1718 a,b, a tool or tools may be required to stretch the sealing ridge 548 a over the stop lip 1718 a,b.

In aspects of the pipe fitting 110 such as that of FIGS. 1-8, 13, 15-22B, the gasket 140,3140 can be retained on the inner end 516 of the pipe fitting 110 due to interference between the sealing ridge 548 a,3148 a and the raised lip 518. In such aspects the sealing ridge 548 a,3148 a can be stretched over the raised lip 518 when inserting the inner end 516 through the sealing ridge 548 a,3148 a and elastic resistance of the sealing ridge 548 a,3148 a can resist withdrawal of the inner end 516 outward through the sealing ridge 548 a,3148 a, thereby retaining the relaxed gasket 140,3140 on the pipe fitting 110. In aspects of the pipe fitting 110 such as those of FIGS. 12 and 14, the inner rim 3050,3250 of the gasket 140 can stretch over the raised lip 518,3018,3218 upon insertion of the inner end 516 into the relaxed gasket 140,3040,3240, and the inner rim 3050,3250 can seat in the groove 3014,3222. Elastic resistance of the inner rim 3050,3250 can resist withdrawal of the inner end 516 of the pipe fitting 110 back through the inner rim 3050,3250, thereby retaining the relaxed gasket 140 on the inner end 516 of the pipe fitting 110. In these aspects of the pipe fitting 110, the housing 171 of the coupling 170 can then be assemble around the gasket 140,3040,3140,3240 by positioning the gasket 140,3040,3140,3240 within the gasket groove 570 of the segments 172 a,b and fastening the segments 172 a,b together with the fasteners 176 a,b. The gasket 140,3040,3140,3240 can then retain the coupling 170 on the inner end 516 of the pipe fitting 110.

Alternatively, for the aspect of the pipe fitting shown in FIG. 11, the coupling 170 may not be retained on the inner end 516 of the pipe fitting 110 by elastic resistance of the gasket 140. Instead the relaxed gasket 140 can be freely slipped over the inner end 516 with no or minimal resistance, and the grooved housing 1371 can be assembled around the gasket 140 and the secondary key 1378. The segments 172 a,b can be aligned so that the gasket 140 fits within the gasket groove 570, and the secondary key 1378 fits within the secondary groove 1372, thereby retaining the coupling 170 on the pipe fitting 110 through interference between the secondary groove 1372 and the secondary key 1378.

Once the coupling 170 is secured on the inner end 516 of the pipe fitting 110, the pipe 500 or another pipe fitting 110 can be stabbed into the assembled coupling 170 opposite from the pipe fitting 110 when the coupling 170 is in the relaxed position. The coupling 170 can then be tightened to the tensioned position by tightening the fasteners 176 a,b, thereby securing and sealing the pipe fitting 110 to the pipe 500 or another pipe element. In other aspects, the assembled coupling 170 in the relaxed position can be slipped over the pipe fitting 110 to secure the coupling 170 on the inner end 516 of the pipe fitting 110. By contrast, aspects defining the stop lip 1718 a,b can be specifically configured to prevent the assembled coupling 170 from being slipped over the stop lip 1718 a,b.

The disclosed examples of pipe fittings 110 are exemplary and should not be viewed as limiting. The pipe fitting 110 can be any type of fitting such as a reducer, sprinkler, wye fitting, nipple, trap, valve, regulator, adapter, quick disconnect coupling end, or any other suitable type of fitting.

One should note that conditional language, such as, among others, “can,” “could,” “might,” or “may,” unless specifically stated otherwise, or otherwise understood within the context as used, is generally intended to convey that certain embodiments include, while other embodiments do not include, certain features, elements and/or steps. Thus, such conditional language is not generally intended to imply that features, elements and/or steps are in any way required for one or more particular embodiments or that one or more particular embodiments necessarily include logic for deciding, with or without user input or prompting, whether these features, elements and/or steps are included or are to be performed in any particular embodiment.

It should be emphasized that the above-described embodiments are merely possible examples of implementations, merely set forth for a clear understanding of the principles of the present disclosure. Any process descriptions or blocks in flow diagrams should be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included in which functions may not be included or executed at all, may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present disclosure. Many variations and modifications may be made to the above-described embodiment(s) without departing substantially from the spirit and principles of the present disclosure. Further, the scope of the present disclosure is intended to cover any and all combinations and sub-combinations of all elements, features, and aspects discussed above. All such modifications and variations are intended to be included herein within the scope of the present disclosure, and all possible claims to individual aspects or combinations of elements or steps are intended to be supported by the present disclosure. 

That which is claimed is:
 1. A pre-assembled coupling assembly comprising: a coupling, the coupling defining a coupling bore extending through the coupling, the coupling bore defining an axis, the coupling comprising a gasket disposed within the coupling bore, the gasket being relaxed and uncompressed when the coupling is in a relaxed position; and a pipe fitting, the pipe fitting defining a first end and a second end, the pipe fitting further defining a raised lip, a sealing surface, and a groove, the raised lip positioned between the first end and the sealing surface, the groove positioned between the second end and the sealing surface, the raised lip extending radially outward from the sealing surface, the groove extending radially inward from the sealing surface, the first end inserted into the coupling bore, the coupling retained on the first end of the pipe fitting when the coupling is in the relaxed position.
 2. The pre-assembled coupling assembly of claim 1, wherein: the gasket defines a first sealing ridge and a second sealing ridge; and the raised lip is positioned axially between the first sealing ridge and the second sealing ridge with respect to the axis.
 3. The pre-assembled coupling assembly of claim 1, wherein the gasket defines a center ridge that contacts the raised lip when the coupling is in a tensioned position.
 4. The pre-assembled coupling assembly of claim 1, wherein the pipe fitting defines an outer lip and the coupling defines a ridge, and wherein the outer lip is configured to locate the ridge of the coupling above the groove of the pipe fitting.
 5. The pre-assembled coupling assembly of claim 1, wherein the sealing surface is cylindrical.
 6. The pre-assembled coupling assembly of claim 1, wherein the raised lip is spaced apart from the first end.
 7. The pre-assembled coupling assembly of claim 1, wherein a radially outermost portion of the first end is positioned radially inward from a radially outermost portion of the raised lip.
 8. The pre-assembled coupling assembly of claim 1, wherein the pipe fitting defines an outer surface extending between the first end and the second end, and wherein a portion of the outer surface positioned between the first end and the raised lip is cylindrical.
 9. The pre-assembled coupling assembly of claim 1, wherein a circumferential gap extends through the raised lip. 